Nozzle-plug.



A. R. DODGE.

NOZZLB PLUG.

GATION FILED Nov.

Patented Dec. 1, 1914,

APPL

v Inventor* I .JCTuStin RDod Fipjl.

Witnesses:

UNITED sTATEs y f-Frr AUSTIN R. DODGE, 0F SCHENECTADY, NEW YORK,ASSIGNOR TO GENERAL ELECTRIC COMPANY, AVCORPORATION OF NEW YORK.

- NOZZLE-PLUG.

specification of Letters rate'n'z.

Patented Dec. 1 1914.

yeter, and has for its object to improve their construction, particularreference be.- ing made to the means for compensating for expansions andcontractions due to temperature changes, to supporting .the plugs attheir inside ends, to limiting the pressure difference created therebyfor iuids How/ing at high velocity, and to means for freeing the plug ofdirt and other foreign matter.

In the accompanying drawing, which is illustrative of my invention,Figure 1 is a longitudinal section of a plug showing the parts arrangedto slide on each other to compensate for tem erature changes; Fig. 2 isa cross-section ta en on line 2-2 of. Fig. 1; Fig. 3 is a partial axialsection of a high velocity plug; Fig. 4 is a cross-section of the same;Fig. 5 is an axial section of a modified form of sliding connectionbetween the inner and'outer parts; Fig. 6 is a cross-section of thesame; and Fig. 7 is a detail view showin means for blowing foreignmatter outvof t e plug.

10 indicates the main through which the iuid to be metered iows. It maybe liquid, air, steam, or other vapors. 4

11 indicates the base of the nozzle plug which is screwed into a .tappedhole in the main. It is provided with a squared head 12 to receive awrench. In the head are four screw-threaded ports or openings of which13 and 14 are arranged in one pair and 15-and 16 in another. `Theopenings 13 and 15 are connected by passages to the oriiices in thenozzle plug which face the moving column of liquid and are commonlyreferred to as the leading or high pressure openings. The openings 14and 16 are connected to the rear and side orifices of the nozzle plugand the moving column of liquid in passing the plug tends to create asuction eifect therein. These'y are commonly referred to as the lowpressure or trailing openings. The plug can be adapted for service in amain Where the How is yfrom right to left, .or left to right, or up ordown. F urther, the pipes 17 and 18 connecting the plug withthe'manometer should be in the same horizontal plane to insure equalWater columns above the mercury. To provide for this and to insure theorifices in the plug facing in the proper direction, the additional setof openings 15 and 16 is provided. As shown, the meter, manometer, orother device, is connected to the plug by the pipes 17 and 18, eachcontaining a shut-off valve 19. If the direction of the iuidwasdownward, as in a vertical pipe, the manometer would be connected by thepipes 21 and 22, each 'having a shut-olf valve 23.

Formerly it was the practice to plug up the holes or ports not in use,but I have discovered that they can. be utilized in cleaning the nozzleplug of foreign matter. Assuming that the manometer or other device isconnected to pipes 17 and 18,-thepipes 21 and 22 are screwed into theopenings-15 and 16 and the valves 23 closed. Under these conditions themeter will work in the ordinary manner. Assuming now that it. is desiredto clean the plug, instead of shutting down the system and taking theplug out of the main I first shut the valves 19 to prevent the mercuryin the manometer from being driven but, and then'open the valves 23 andpermit fluidI to be discharged into the atmosphere through the plugunder the full pressure of the main. This will carry out any foreignparticles which may be lodged in the various passages in the plug, afterwhich the valves can be closed and the normal operation of the meterwill be resumed. As an additional cleansing means the screw plug 24 isprovided and located in line with the tubular member 28 in the center ofthe plug. By removing the screw plug access mav be had to the interiorof said member.

The base 11 of the nozzle plug is purposelyv made quite large and isprovided with radiating iins'24 to facilitate the condensation of vaporin the passages in Vthe plug. [They will be unnecessary where air orwater is being metered, but since it is preferable to use a standardconstruction as far as possible for all purposes they .may be retained.The base is counter-bored to receive the orifice tube 25, which vextendsperpendicular to the direction et tlow et the iiuid. ln order to obtainthe best ei2m ects it should extend substantially across 'the main sothat the average velocity of the fluid stream, instead ot that at anygiven point, will be utilized. lWhere the mains are small in diameter itis entirely satisfactory to support the tube from the base only, butwhere the main is large as is lthe case tor water, these tubes may be dto i it. longs or even longer, and it becomes necessary to support themat their inner ends. This is accomplished by drilling and tapping themain l@ in line with the plug` and inserting; therein a screw-threadedsupporting piece 2@ that makes a reasonably goed t with 'the bore of theorilice tube. 'lhe arrangement between the support 26 and the tube 25should be such that the tube is free to er:n pand and contract withtemperature changes without restraint from the part 26. llhen used withsteam the support 26 has suitable drainage openings 26, shown in dottedlines.

rl`he tube 25 is provided with a plurality of oriiices 2'? which facethe moving column of fluid. lhese are distributed subst-antially overthe entire length ot the tube and in the same plane so that the averageimpact ot the Huid will be obtained as distinguished trom the impact atone point only. Screwthreaded to the lbase and located inside ot theorice tube is a tubular member 28 et rather small diameter. This is inturn surrounded by a sleeve 29 and between the sleeve and tube is asmall :annular space through whichthepressure, due to the impactyorifices 2'?, is conducted to the cham ber 30, the latter communicatingwith the leading pipe l? connected to the manometer. ln order topreserve the proper relation be tween the outer end of the sleeve 29 andthe tube 25, spacing devices are provided. ln Fig. l they are shown inthe torni ot pins 3l carried by the sleeve and having; rounded heads inengagement with the orice tube. Generally three or tour ot these pinsmay be provided. An alterna tive arrangement of the spacing device isshown in Fig. 3 wherein the upper end oi the sleeve 29 is split at asuitable number et places, say three tor example, and the little tongues32 thus termed are bent outward into engagement with the inner wall ofthe orifice tube.

Referring now to the low pressure or trailing side et the device, thetubular member 28 is screw-threaded into the base and at its upper endis provided with a head or block 35 which contains a chamber 86 and oneor more small passages 36 communieating with trailing orifices in thetube 25 'lhe head Aor bloclr may be secured to the member in anysuitable manner5 as, for en ample, by screw threads.. From practical serexperience l have tound that usarle plugs of this character sometimesbrealr in the region ofthe block when subjected to steam. This isoccasioned by the admission oie. relatively cold water to the innermember 28 :trom the pipe i7 and its usual connected reservoir. 'lheentrance ci? water to said member has the edect ot chilling it and thuscausing it to contract. the other hand, the orifice tube is stillsubjected to heated vapor and retains its elongated term. lt the bloch35 is directly fastened to the orice tube something will have to give itthe dilerence in expansion ol' the parte is great. will either strip thethreads old et the member 28 or brealr the pins or other connectionbetween the bloclr and the tube. l have discovered that thisobjectionable feature can be avoided in a very simple manner and at thesame time the proper pressure conditions between the leadinen andtrailing sides preserved. rlhe sliding' block is drilled with as manyholesas it is desired to have trailing openings through the criticotube. lnto each orn these holes is screwed hollow pin 38. its' shown inthe gures, three hollow pins are shown.` the opening in each pincommunicating with a passage 36 in the bloclr. lnstead of making theholes in the orinee tube for the pins or the same diameter l make themlarger and in the torni of slots 38- so that the block orihce tube .canmove with respect to each other without shearing oli? the pins. Thebloclr should be long enough7 measuring? 'in an axial directions tocover the slotsand preventv kthe impact pressure lfrom bypassing intothe trailing, low pressure or suction oriices7l thereby decreasing1 thepressure ditterence, it being remembered that the pressure within thetube 25 is greater than in the chamber 36 in the bloclr 35. lt is,howeverj necessary topermit iluid under pressure to pass through thetube trom the top to the bottom of the block and to this end the bloclris provided with a number ot grooves 39 'formingl passages which permittree communication between the chambers above and below it.

instead el screwing the pins Bdinto the head or block and slot-ting theorihce tube, the arrangement shown in ligs i and il can be employed. lnthese ligure: the block or head 35 is no longer centered and guided bythe inner wall of the oritice tube as it is smaller in diameter than itsbore. Il" obtain the 'same edect, however, as in the cunstruc-` tionshown in liig. l by mounting on the outside oil the orice tube a ring;d0, said ring being connected with the block by hollow pins 38 thatextend through the slots 38 in the tube 25, As the tubular member 28expands and contracts, the block 35 will move up and down' within the.tube 25 with-v outdisturbingg:it9 and since the slots 38' liti ltltilll@ niiaaei are covered by the ring leakage rc'im one set of orificestothe other will be avoided.

For a majority of the cases, the construction heretofore illustratedwill be entirelyv satisfactory", but there are conditions where thevelocity of the fluid in the pipe is very high and a` nozzle plugof thetype described will give too great a pressure difference for themanometer; that is to say, the pressure difference will be so great thatit will either force mercury out oi? the manometer, or move it to aregion outside of the normal. To provide for a condition of this hind,in` stead of having two side'openings and one rearwardly opening passage362 asin Fig. 2, the parts are so arranged that there are one forwardlyopening passage i1 and two side opening passages 38 as before. rlhe eectof the passage 41 facing the moving column of fluid is to somewhatincrease the pressure of the uid from the side opening passages 36", thepressure actuallyfentering the tubular member 29 being a resultant ofthepressures in the' three passages. The net eiiect of this is to decreasethe ressure di'erence in the pipes 17 and 18 leading to the manometer.For example, for a given ow,-with the passages in pins 38 arranged as inFig. 2, the'mercury deflection in the manometer may amount to 1%. Underthe same condition, if the arrangement-shown in Fig. 4 is employed, themercury deflection will only be about 1.

1n accordance with the provisions of the patent statutes, 1 havedescribed the principle of operation of my invention, together with theapparatus which 1 now consider y.ton

represent the best embodiment thereof; but l desire to have itunderstood that the apparatus shown is only illustrative and that theinvention can be carried out by other meDS.'

What l claim as new and desire to secure by Letters Patent ofthe UnitedStates, is

1. In a nozzle plug, the combination of a base containing passages andadapted to be attached to a 'uid carryin main, an orifice tube supportedthereby an communicating with one of said passages, a tubular memberalso carried by the base and located inside of the tube andcommunicating with another of said passages and a block `carried by the-member that is movable independently ,of the tube, said block havingone or mle orices registering with those in the i 2. In a nozzle plug,the combination of a base containin passages and adapted to beA'attached to a uld carrying main, an orifice tube supported thereby andcommunicating with one of said assages, a tubular member also carried byt e base and located inside of the tube and communicating with anotherof said passages, and a block carried by the member that is movableindependently tube supported thereby and communicating with one of saidpassages. a tubular-member also carried by the base and located insideof the tube and communicating with another of said passages, a blockcarried by the tubular member and containing a passage in' com--rnunication with that in said vmember, and

means that are mounted on one of the parts and convey iuid underpressure from the4 outside of the orifice tube 'to said member, saidmeans also serving to prevent the block from turning within the orificetube.

4.-. In a nozzle plug, the combination of a base containing passages andadapted -to be attached to a fluid carrying main, an orificetubesupported thereby and communicating with one of said passages, atubularv member also carried by the base and located inside of the tubeand communicating with another of said passages, a sleeve that surroundssaid member and is separated from it and -the orifice tube by annularspaces, means for centering the sleeve within the said tube, and a blockcarried by the member which communicates with the region outside of thetube, said space and tubular member communicating with the passages inthe base. 'p

5. 1n a nozzle plug, the combination of a base containing passages andadapted to beattached to a Huid carrying main, an orifice 4tubesupported thereby and communicating in across it, said plug creatinglapressure di erence that varies with changes in the rate of `flow ofduid in the main, and a device screw-threaded into the main on` the sideopposite the base which is in telescopic relation with and holds one endof the tube against 'deectiou 7. 1n combination, a nozzle plug compris#ing a base havin passages and adapted to be secured to a uid carryingmain, an orilice tube mounted on the base and extendingl y across themain, a device carried by the v side of the main opposite the base forhold- `lng one end of the tube against deection,

8. ln a nozzle plug for high velocities, thev combination'ot a base, anorifice tube carried thereby,'the orifices in said tube being adapted toface the moving column of iiuid,

a means carried by the base and containingl orifices subjected to thesuction effects of the column of fluid, and a passage that faces themoving column of uid and acts to partially neutralize the pressurediiterence due to the action oi the orifice-tube and means.

.9. ln a nozzle plug for high velocities, the combination of a base, anorifice tube carried thereby, the oriices in the tube being adapted toface the moving column ot uid, a tube carried by the base, a blockcarried thereby and containing passages subjected to the suction egectof the moving colunfin of fluid, and a passage that is subjected to theimpact .of the fluid and is connected to the hrst named passages topartially neutralize the suction effects of the column of iuid.

10. In a nozzle plug for high velocities, the combination ot a base, atube mounted thereon having orifices which are adapted to face themoving column of fluid, a tubular member also carried by the base andlocated inside the tube, a block mounted on the outer end et the memberand containing a chamber, hollow pins :mounted in the block andconveying huid pressure to the chamber,

one of said pins being. subjected to the impact ot the mowing column offluid and the remainder to the suction eect thereof.

11;. lin a nozzle plug, the combination ota base, an orice tube carriedthereby which is provided with slots, a hollow member secured to the-base and located inside the tube, a block mounted on the member and insliding contact with the tube,the1e being passages through the block toequalize the Huid pressures on opposite sides thereof, andscrew-threaded hollow pins mounted in the block and movable in saidslots.

. 12. lln combination, a main, a nozzle plu comprising a base mounted onthe main an containing .passages arranged in pairs, means carried by thebase for creating a pressuie di'erence responsive to changes in the rateot oW of Huid throughthe main and conimunicating with said passages,pipes connected to one pair ot passages tor conveying Huid pressure tothe point ot utilization, and valved pipes connected to the other-paixlvof passages through which Huidl can be discharged trom the main toclean said nieans of foreign -matter.

ln Witness whereof, l have hereunto set my hand. this 15th day ofNovember, l9l3.

Witnesses: w

Bassanini B. laluna, Maaaaan'r l. lldcotnit.

